I agree with Flags
why brother trying to find one, when who know's, maybe she won't even like hunting( or want to stick with it)
when you can just get a more basic rifle ready to go for her in a caliber that can be readily and ammo in about any store.
I doubt she will care what caliber she gets, and heck, might even prefer a NEW gun that is JUST for HER, over maybe finding a used one , kids can be funny on things like this
and odds are there not caring if you can reload for them or not LOL
the shooting for them is the same on factory ammo or reloaded to them, they just hopefully want to shoot and enjoy the sport!
however if your dead set on having something
maybe look at a Thompson center Encore, and I have to think there are a ton of custom barrel makers out there that will chamber a barrel for you in the caliber !
then again, about any good gun smith can re barrel a action in caliber too!
just don't think the costs will be worth it i !!